This mid back chair is made with an upholstery material called LeatherPlus, which is a leather infused with polyurethane and boast a sturdy 27 inch nylon base with 2 inch nylon dual wheel castors. The chair also offers a spring tilt mechanism which allows one to change the angle of the entire seat relative to the floor and allows one to transfer some of the upper body weight to the backrest of the chair. In addition to the spring tilt mechanism the chair also offers tilt tension, a pneumatic gas lift for an easily adjustable height and an upright lock.